piclist 2006\08\21\190834a
>
Thread:
Solar Array Tracking
www.piclist.com/techref/index.htm?key=solar+array+tracking
BY
:
email (remove spam text)(Olin Lathrop)
Brian Riley wrote:
> Now, if
> you consider a manual array mounting rack (manual meaning, you go out
> at some regular interval, say once a month,
This part seems like the "why bother". If I remember right, the earth tilts
+-22.5 degrees over a year. So if you point a collector at the equanox sun
height, you're never off by more than 22.5deg, and less than half that on
average. Cos(22.5deg) = .924, which means you have 7.6% loss worst case.
Cos(11.25deg) = .981, so you lose less than 2% averaged over a whole year
with no vertical (seasonal) adjustment at all. The daily sun travel angle
is much more, so tracking horizontally would be a bigger bang, although also
more complicated and expensive.
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